Oil Light issue

Happy Friday to All
Chasing an annoying electrical gremlin on a '65 Newport.
The oil light will not illuminate when the ignition switch is on or accessory. It will flash when you turn the switch off. I have grounded the lead (single gray wire) from the sender with no change.
With the wire either installed on the sender, or grounded with no change, I have ruled out the sending unit. As the light will flash, I believe the circuitry is intact. So that leaves the ignition switch itself. I do...

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Author: Omni